I have to say Moto Guzzi have changed the Stelvio a bit since the model I had a 2010 NTX. The new, bigger 32L tank (up from a hopeless 18L) has meant they have re-shaped the stock seat to make it easier to get your feet down. The result is that it is a lot narrower at the front and does not give enough support to the bottom. The angle of the seat has also changed slightly. The good news is the original front section of the seat as fitted to '08 - '10 model bikes fits straight on and is very comfy, probably the best stock seat I've had.
The seat also needs to be in the higher position to maximise legroom, I also fitted some SW Motech comfort pegs which were on my V-Strom 1000 (and are now on my S10, cracking value) and at 10mm lower made a huge difference and stopped my knees clattering the L/H/S cylinder head, the right pot is slightly more forward anyway.
As with most stock bikes the standard screen is poo and a Givi with MRA spoiler sorted it out a treat. I had it absolutely flat out in Germany chasing an E class Merc' with no buffeting at all, not bad for a Sat Nav indicated 141mph... As they are such a heavy old girl they are incredibly stable and are surprisingly agile through the bends too. It used to really eat tyres too, probably down to the weight ?
I probably would have another one at some point, maybe when it goes up to 1300cc as is often touted in the bike press.
